To unlock the following achievements, do the required actions under the default settings:
Co-Op: beat level 1 with another player
Co-Op Master: beat the game with another player
First Boss: beat the final boss in level 1
Second Boss: beat the final boss in level 2
Third Mini-Boss: beat the final boss in level 3
Final Boss: beat the final boss in level 3
High Score: first place on the game score board
Level 1 Master: beat level 1 without continuing
Level 2 Master: beat level 2 without continuing
Level 3 Master: beat level 3 without continuing
Game Master: beat the game without continuing
Cash Pile: 2,000,000 points at the end of level 1